I want to digitally sign all outbound data from my computer. Can someone suggest

Question

I want to digitally sign all outbound data from my computer. Can someone suggest a way to do this programatically or using some tool? Instead of actually signing the data, I would simply append a small random string at the end. (It's the same thing as long as website doesn't care about signatures. Unless I am wrong.)

I want to see websites' response to signed data with funky tails when they do not expect it. This is important aspect of an experimental protocol that I am working on. I would like to see if it breaks my internet or the websites simply ignore it. Thanks in advance!!

Explanation / Answer

I think the scope of this question is a little too broad...

Do you have any idea how many packets must be leaving your computer right now, just by browsing stack exchange?! If not, I suggest you download wireshark and monitor your own network card, you might be surprised!

I think this is actually an interesting experiment, but you'll have to do it in small chunks. Instead of adding 'some random data' to all packets, how about just trying against one site or application?

I would be wary of just doing it without letting people know though, as it may be viewed as malicious communications. It might be best at first to have your own web server with a simple page or pages and try and interact with it, watching the packets in wireshark. Once you understand what's going on, try and write an equivalent using Python in something like scapy, and see if your local web server responds in the same way

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